圣杯布局

  • float布局

  • margin负值

  • 防止两侧被覆盖，用padding

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    html,body{
      margin: 0px;
      padding: 0px;
    }
    .body{
      min-width: 700px
    }
    .container{
      padding: 0px 150px 0px 200px;
    }
    .container::after{
      content: "";
      display: block;
      height: 0;
      clear: both;
      visibility: hidden;
    }
    .main{
      float: left;
      width: 100%;
      background: #ccc;
    }
    .left{
      float: left;
      width: 200px;
      margin-left: -100%;
      background: #555;
      position: relative;
      right: 200px;
    }
    .right{
      float: left;
      width: 150px;
      margin-right: -150px;
      background: #233;
    }
  </style>
</head>
<body class="body">
  <div class="container">
    <div class="main">main</div>
    <div class="left">left</div>
    <div class="right">right</div>
  </div>
</body>
</html>

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